{"product_id":"waimana-flow-activated-uv-unit-33w-48w-25mm-bsp-whole-house-uv-treatment-nz","title":"Waimana Flow-Activated UV Unit - 33W \u0026 48W, 25mm BSP, Whole House UV Treatment NZ","description":"\u003cp\u003eUV treatment for homes that already have pre-filtration in place — or new installs being built alongside a filter system. The Waimana UV unit adds flow-activated ultraviolet treatment to your existing setup, treating water against bacteria, viruses, and microbes without chemicals.\u003c\/p\u003e\n\n\u003cp\u003eThe integrated flow switch is the key feature. The UV lamp only activates when water is moving. When flow stops, the lamp shuts off automatically. No water warming in a lit chamber between uses, no unnecessary power draw, no lamp running idle overnight.\u003c\/p\u003e\n\n\u003cp\u003eAvailable in 33W (30 LPM) for smaller homes and baches, and 48W (45 LPM) for medium to large homes with higher flow demand.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eUV unit only — no filter housings or cartridges included. For effective UV treatment, pre-filtration must be installed upstream.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eKey specs at a glance\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e33W\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e48W\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV lamp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e33W\u003c\/td\u003e\n\u003ctd\u003e48W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV dose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 mJ\/cm²\u003c\/td\u003e\n\u003ctd\u003e30 mJ\/cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax flow rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 L\/min\u003c\/td\u003e\n\u003ctd\u003e45 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25mm BSP\u003c\/td\u003e\n\u003ctd\u003e25mm BSP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e116 PSI \/ 8 bar\u003c\/td\u003e\n\u003ctd\u003e116 PSI \/ 8 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2–40°C\u003c\/td\u003e\n\u003ctd\u003e2–40°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e240V\u003c\/td\u003e\n\u003ctd\u003e240V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV lamp life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eVaries with usage\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e3 years\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy choose the Waimana UV unit\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eFlow-activated UV — lamp only runs when water is moving, saving power and extending lamp life\u003c\/li\u003e\n  \u003cli\u003ePrevents water warming in the chamber during no-flow periods — no stagnant heated water between uses\u003c\/li\u003e\n  \u003cli\u003eChemical-free treatment — no dosing, no additives, no ongoing consumable cost beyond the lamp\u003c\/li\u003e\n  \u003cli\u003eTwo wattage options — 33W for smaller homes and baches, 48W for larger homes and higher flow demands\u003c\/li\u003e\n  \u003cli\u003eStandard 25mm BSP connection — suits most existing NZ plumbing setups\u003c\/li\u003e\n  \u003cli\u003eCompact and wall-mounted — easy to integrate into an existing filter system\u003c\/li\u003e\n  \u003cli\u003eEverything included — UV lamp, quartz sleeve, ballast, flow switch, spring, and O-rings\u003c\/li\u003e\n  \u003cli\u003e3-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow it works\u003c\/h2\u003e\n\u003cp\u003eThe UV chamber sits downstream of your pre-filtration. Water flows through the chamber where the UV lamp treats it against bacteria, viruses, and microbes. The lamp delivers a UV dose of 30 mJ\/cm² — the level recognised for effective microbiological treatment.\u003c\/p\u003e\n\u003cp\u003eThe integrated flow switch controls the lamp automatically. When a tap opens and water moves, the lamp activates. When flow stops, it shuts off. This prevents the water in the chamber from warming up during idle periods, which would otherwise create a small volume of warm, potentially stale water at the head of the UV chamber each time a tap opens.\u003c\/p\u003e\n\u003cp\u003eFor UV to work effectively, the water entering the chamber must be clear. Pre-filtration is essential — sediment and turbidity block UV light from reaching micro-organisms in the water. If you're pairing this unit with a new filter system, get in touch and we'll help you choose the right pre-filtration configuration to work upstream of this unit.\u003c\/p\u003e\n\n\u003ch2\u003eChoosing between 33W and 48W\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e33W\u003c\/strong\u003e — suits smaller homes, baches, and holiday homes with lower flow demand. Maximum flow rate of 30 L\/min delivers a UV dose of 30 mJ\/cm².\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e48W\u003c\/strong\u003e — suits medium to large homes and higher-demand rural properties. Maximum flow rate of 45 L\/min at 30 mJ\/cm². The higher wattage lamp delivers the same UV dose at a higher flow rate, making it the right choice where multiple taps or appliances may be drawing water simultaneously.\u003c\/p\u003e\n\u003cp\u003eIf you're not sure which suits your household, get in touch and we'll help you choose.\u003c\/p\u003e\n\n\u003ch2\u003eImportant — pre-filtration required\u003c\/h2\u003e\n\u003cp\u003eUV treatment is only effective when water entering the chamber is clear. This unit does not include filter housings or cartridges. Pre-filtration must be installed upstream before the UV chamber. At minimum, a 1 micron final sediment stage is recommended before the UV unit. For new installs, get in touch and we'll help you select the right pre-filtration configuration to pair with this unit.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV lamp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e33W or 48W (select from dropdown)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV dose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 mJ\/cm² at rated flow\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax flow rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 L\/min (33W) \/ 45 L\/min (48W)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25mm BSP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e116 PSI \/ 8 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2–40°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e240V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActivation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlow switch (auto-on when water flows, auto-off when flow stops)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV lamp life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVaries with usage\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 years\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUV lamp, quartz sleeve, ballast, flow switch, spring, O-rings\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDoes not include\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFilter housings or cartridges\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWaimana UV chamber (stainless steel)\u003c\/li\u003e\n  \u003cli\u003eUV lamp\u003c\/li\u003e\n  \u003cli\u003eQuartz sleeve\u003c\/li\u003e\n  \u003cli\u003eBallast with power lead and 3-pin plug\u003c\/li\u003e\n  \u003cli\u003eFlow switch\u003c\/li\u003e\n  \u003cli\u003eSpring\u003c\/li\u003e\n  \u003cli\u003eO-rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eDo I need pre-filtration before this unit?\u003c\/h3\u003e\n\u003cp\u003eYes — UV treatment is only effective when water entering the chamber is clear. Sediment and turbidity block UV light from reaching micro-organisms. Pre-filtration is essential. At minimum, a 1 micron sediment stage upstream is recommended. If you're building a new system, get in touch and we'll help you configure the right pre-filtration to pair with this unit.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between 33W and 48W?\u003c\/h3\u003e\n\u003cp\u003eBoth deliver a UV dose of 30 mJ\/cm² — the difference is flow rate. The 33W handles up to 30 L\/min; the 48W handles up to 45 L\/min. Choose based on your household size and peak water demand. Smaller homes and baches suit the 33W; medium to large homes with higher simultaneous demand suit the 48W.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does flow-activated mean?\u003c\/h3\u003e\n\u003cp\u003eThe integrated flow switch detects when water is moving through the system and turns the UV lamp on. When flow stops — all taps off, no demand — the lamp shuts off automatically. This prevents water sitting in a lit, warming chamber between uses, and means the lamp isn't running unnecessarily.\u003c\/p\u003e\n\n\u003ch3\u003eHow long does the UV lamp last?\u003c\/h3\u003e\n\u003cp\u003eUV lamp life varies with usage — specifically, the volume of water that flows through the system. The more water used daily, the sooner the lamp reaches the end of its effective UV output. UV output degrades before the lamp visibly fails, so don't wait for it to stop glowing. Replace on schedule and clean the quartz sleeve at each lamp change.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the quartz sleeve?\u003c\/h3\u003e\n\u003cp\u003eThe quartz sleeve surrounds the UV lamp inside the chamber, keeping the lamp dry while allowing UV light to pass through to the water. Scale or deposits on the sleeve reduce UV transmission and treatment effectiveness. Clean it at each lamp change and replace if it becomes scratched or cloudy.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need bypass valves?\u003c\/h3\u003e\n\u003cp\u003eThey're not included but worth adding. Bypass valves let you isolate the UV unit during lamp and sleeve changes without shutting off water to the rest of the house. Ask us about adding a set when you order.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need a plumber to install it?\u003c\/h3\u003e\n\u003cp\u003eFor most customers, yes — a licensed plumber is the safest path. The unit uses standard 25mm BSP fittings and plugs into a standard 240V outlet. If you're confident with household plumbing, the installation is straightforward. Get in touch if you're unsure.\u003c\/p\u003e\n\n\u003ch3\u003eWhat warranty does it come with?\u003c\/h3\u003e\n\u003cp\u003e3 years, covering the UV chamber and workmanship. The UV lamp is a consumable and is not covered by the product warranty.\u003c\/p\u003e\u003cdiv style=\"background:#fff3cd;border:1px solid #ffc107;border-radius:8px;padding:16px;margin:20px 0;\"\u003e\n\u003cp style=\"margin:0 0 8px;font-weight:700;color:#856404;\"\u003e⚠️ Disclaimer – Collective \/ Dropship Product\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;color:#856404;\"\u003eThis product is supplied \u0026amp; shipped directly by the brand via Shopify Collective. Estimated delivery: 2–4 working days NZ-wide. Action Outdoors is not responsible for shipping delays from the supplier.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Filtration Station NZ","offers":[{"title":"UV 33w","offer_id":51984007332125,"sku":"Waimana UV 33w","price":625.0,"currency_code":"NZD","in_stock":false},{"title":"UV 48w","offer_id":51984007364893,"sku":"Waimana UV 48w","price":765.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0864\/1072\/3613\/files\/48wUVKitwithFlowSwitch.jpg?v=1783221855","url":"https:\/\/actionoutdoors.kiwi\/products\/waimana-flow-activated-uv-unit-33w-48w-25mm-bsp-whole-house-uv-treatment-nz","provider":"Action Outdoors Limited","version":"1.0","type":"link"}